1GAMMA(3) Library Functions Manual GAMMA(3)
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6 im_gammacorrect - carry out gamma correction
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9 #include <vips/vips.h>
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11 int im_gammacorrect(in, out, exponent)
12 IMAGE *in, *out;
13 double exponent;
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17 im_gammacorrect performs gamma correction to in. The result in written
18 in out. The correction is carried out by creating a lookup table using
19 the double exponent and mapping in through it. The exponent is applied
20 on a ramp lut and the resultant lut is scaled. All channels of im are
21 mapped through the lookup table.
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24 im_histgr(3), im_heq(3), im_histeq(3), im_identity(3), im_maplut(3)
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27 N. Dessipris
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30 N. Dessipris - 10/05/1991
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34 10 May 1991 GAMMA(3)